Compact polarimetry based on symmetry properties of geophysical media:: The π/4 mode
Compact polarimetry based on symmetry properties of geophysical media:: The π/4 mode
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DOI：
10.1109/tgrs.2004.842486
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发表时间：
2005-03-01
影响因子：
8.2
通讯作者：
Lee, JS
中科院分区：
文献类型：
--
作者：
Souyris, JC;Imbo, P;Lee, JS
在本文中，我们基于混合基础测量评估合成孔径雷达 (SAR) 紧凑型偏振测量架构的性能，其中发射器偏振为圆形或 45 度 (pi/4) 方向，接收器相对于雷达视线处于水平和垂直偏振。提出了一种原始算法来从该架构重建完整的偏振（FP）信息。性能评估是双重的：首先涉及与 FP 相比保留的信息水平，无论是点目标分析还是农田分类，均使用在 Landes 森林上获取的 L 波段 SIRC/XSAR 图像和在 Flevoland 上获取的喷气推进实验室 AIRSAR 图像。然后，它解决了空间实现的复杂性，包括处理的条带、下载特征、功率预算、校准和电离层效应。这种混合基础模式（以下称为 pi/4 模式）传输中的偏振唯一性保持了标准的较低脉冲重复频率操作，因此最大化了传感器的覆盖范围。由于发射机和接收机基础之间的不匹配，功率预算恶化了 3 dB，但可以部分得到补偿。
In this paper, we assess the performance of synthetic aperture radar (SAR) compact polarimetry architectures based on mixed basis measurements, where the transmitter polarization is either circular or orientated at 45degrees (pi/4), and the receivers are at horizontal and vertical polarizations with respect to the radar line of sight. An original algorithm is proposed to reconstruct the full polarimetric (FP) information from this architecture. The performance assessment is twofold: it first concerns the level of information preserved in comparison with FP, both for point target analysis and crop fields classification, using L-band SIRC/XSAR images acquired over Landes forest and Jet Propulsion Laboratory AIRSAR images acquired over Flevoland. Then, it addresses the space implementation complexity, in terms of processed swath, downloading features, power budget, calibration, and ionospheric effects. The polarization uniqueness in transmission of this mixed basis mode, hereafter referred to as the pi/4 mode, maintains the standard lower pulse repetition frequency operation and hence maximizes the coverage of the sensor. Because of the mismatch between transmitter and receiver basis, the power budget is deteriorated by a factor of 3 dB, but it can partly be compensated.